Non-Brownian particle gel

Chia-Nan Yuan; Yu-Jane Sheng; Heng-Kwong Tsao
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p234103
Academic Journal
Particle gels are usually formed by density matching or Brownian motion against gravity. However, the suspended state of non-Brownian particles is essential in applications, such as Si-wafer wire sawing. By the addition of alkyl amine, micron-sized SiC suspensions are shown to form particle gel in ethylene glycol. The ratio of storage to loss modulus is about 3, indicating a weak gel. The structure by particle-particle attraction is demonstrated through existing yield stress. With increasing surfactant concentration, the gel forms easier, the sediment layer swells more significantly, and the yield stress is greater accordingly. A gelling mechanism has been proposed and examined.


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